Yunnan Yuxi Xianfu Steel (Group) Co., Ltd.

4E: HRB400 level seismic steel bar. 038: Yunnan Yuxi Xianfu Steel (Group) Co., Ltd. XF: Manufacturer’s trademark or abbreviation. 8: Nominal diameter of steel bar.

The 4e on the threaded steel bar means HRB400 seismic steel bar (HRB400e). 4 is HRB400 (formerly known as grade 3 steel bar), and e is the e in earthquake, which means earthquake resistance. The steel bars marked with e have reached the national "seismic resistance" steel standards. HRB400E refers to the third level seismic steel bar. The elongation rate of seismic steel bars is required to be no less than 9%, which is much higher than the standard for ordinary steel bars. It is the improvement of these technical indicators that strengthens the seismic resistance of steel bars, allowing them to stabilize without breaking when they tilt or deform, thus reducing some casualties. Compared with ordinary steel bars, its biggest advantage is that its tensile strength and elongation are relatively large. For example, the tensile strength of ordinary hrb400 third-level steel bars is required to be greater than 400MPa, and if it is hrb400e earthquake-resistant steel bars, the tensile strength needs to reach 550MPa. above.